Javascript Example
Screen shot
Javascript code to check you click on check box or not.

<html>
<head>
<script language=\"javascript\">
function show()
{
if(document.frm.mycheckbox.checked)
{
alert(\'You are checked Me\');
}
else
{
alert(\'You are not checked Me\');
}
}
</script>
</head>
<body>
<form name=\"frm\">
<input name=\"mycheckbox\" id=\"mycheckbox\" type=\"checkbox\" value=\"Select Me\">Select Me
<br>
<input name=\"btn\" type=\"button\" value=\"Click Here\" onClick=\"show();\" />
</form>
</body>
</html>

You can download source code here